Linked Life Data

16395429

Source:http://linkedlifedata.com/resource/pubmed/id/16395429

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2006-1-5
pubmed:abstractText
Topical PDT treatment of the common skin disease acne vulgaris is now in clinical use. Propionibacterium acnes (P. acnes) is known to play an important role in acne. 5-Aminolevulinic acid (ALA) supplementation leads to an enhanced porphyrin production in the bacteria. Subsequent illumination with light of the proper wavelengths can reduce the number of bacteria and this might at least partly explain the PDT effect on acne. We have assessed the effects of temperature on P. acnes washed cell suspensions incubated for 4 h with ALA or ALA methyl ester (m-ALA). The effect on porphyrin production of both the cell suspension incubation temperature as well as the initial growth temperature of the cultivated cells prior to harvesting and use in suspension experiments was investigated. The bacterial porphyrin content was estimated from fluorescence emission spectra. It was found that incubation with ALA or m-ALA at a temperature 42 degrees C resulted in an approx. 100% and 33% increase in the total amount of PDT-relevant porphyrins produced as compared to incubation at 37 degrees C. These results support increasing the skin temperature during incubation with ALA or m-ALA in the clinic. The initial growth temperature, prior to the incubation, had no apparent effect on the ALA or m-ALA induced porphyrins. Activation energy studies indicate slightly higher temperature dependence in the case of ALA produced porphyrins as compared to m-ALA produced porphyrins (77 and 65 kJ mol(-1), respectively).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
1474-905X
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
66-72
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
The temperature dependence of porphyrin production in Propionibacterium acnes after incubation with 5-aminolevulinic acid (ALA) and its methyl ester (m-ALA).
pubmed:affiliation
Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. stale.ramstad@phys.ntnu.no
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't